Locks by KeyGuard. Details:Car Window Lock Box The SL-591 KeyGuard Pro car window lock box is the perfect solution for anyone needing to store keys in a convenient place near their vehicle. Its large, full metal body makes it very secure while providing room for keys, key FOBs, or other small items. The internal dimensions for the car lock box when closed are: 4″ x 2-3/8″ x 1-1/8″ with a 4-3/8″ diagonal. A protective rubber cover is also included to keep the key pad safe from the elements. Secure Your Keys & Valuables Stop worrying about hiding your keys in a convenient location and simply store them in the KeyGuard. Its familiar, punch button key pad entry offers user friendly number or letter combinations. The combination is also easy to change with the provided tool.